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69 lines
2.8 KiB
HTML
69 lines
2.8 KiB
HTML
<!DOCTYPE html>
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<title>Nested right-constrained position:sticky elements should render correctly</title>
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<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
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<meta name="assert" content="This test checks that nested position:sticky elements with a right constraint render correctly" />
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../resources/sticky-util.js"></script>
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<body></body>
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<script>
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test(() => {
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const elements = setupNestedStickyTest('right', 25, 35);
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elements.scroller.scrollLeft = 200;
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);
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// The inner sticky should not be offset from the outer.
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const nonStickyInnerLeftX = elements.sticky.clientWidth -
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elements.innerSticky.clientWidth;
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assert_equals(elements.innerSticky.offsetLeft, nonStickyInnerLeftX);
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}, 'before reaching the sticking point, neither sticky box should be offset');
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test(() => {
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const elements = setupNestedStickyTest('right', 25, 50);
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elements.scroller.scrollLeft = 150;
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX);
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assert_equals(elements.innerSticky.offsetLeft, 50);
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}, 'the inner sticky can stick before the outer one if necessary');
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test(() => {
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const elements = setupNestedStickyTest('right', 25, 35);
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elements.scroller.scrollLeft = 100;
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const nonStickyLeftX = elements.container.offsetLeft +
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elements.filler.clientWidth;
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const nonStickyBottomX = nonStickyLeftX + elements.sticky.clientWidth;
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const targetBottomX = elements.scroller.clientWidth +
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elements.scroller.scrollLeft - 25;
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const stickyOffset = nonStickyBottomX - targetBottomX;
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assert_equals(elements.sticky.offsetLeft, nonStickyLeftX - stickyOffset);
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// The inner sticky has similar math, but its offsetLeft is relative to the
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// sticky element and in this test is (height - the difference between the
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// top values).
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assert_equals(elements.innerSticky.offsetLeft, 40);
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}, 'both sticky boxes can be stuck at the same time');
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test(() => {
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const elements = setupNestedStickyTest('right', 25, 100);
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elements.scroller.scrollLeft = 0;
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assert_equals(elements.sticky.offsetLeft, elements.container.offsetLeft);
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assert_equals(elements.innerSticky.offsetLeft, 0);
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}, 'neither sticky can escape their containing block');
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test(() => {
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const elements = setupNestedStickyTest('right', 25, 500);
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elements.scroller.scrollLeft = 200;
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// It doesn't matter how big the inner sticky offset is, it cannot escape its
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// containing block (the outer sticky).
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assert_equals(elements.innerSticky.offsetLeft, 0);
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}, 'the inner sticky cannot be pushed outside the outer sticky');
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</script>
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